51555321253 has 4 divisors (see below), whose sum is σ = 52011563148. Its totient is φ = 51099079360.

The previous prime is 51555321227. The next prime is 51555321313. The reversal of 51555321253 is 35212355515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389786049 + 51165535204 = 19743^2 + 226198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51555321253 is a prime.

It is a super-2 number, since 2×51555321253² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555321953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228120778 + ... + 228121003.

It is an arithmetic number, because the mean of its divisors is an integer number (13002890787).

Almost surely, 2^51555321253 is an apocalyptic number.

It is an amenable number.

51555321253 is a deficient number, since it is larger than the sum of its proper divisors (456241895).

51555321253 is a wasteful number, since it uses less digits than its factorization.

51555321253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456241894.

The product of its digits is 112500, while the sum is 37.

Adding to 51555321253 its reverse (35212355515), we get a palindrome (86767676768).

The spelling of 51555321253 in words is "fifty-one billion, five hundred fifty-five million, three hundred twenty-one thousand, two hundred fifty-three".